According to the CR2, Canon will soon announce a new RF zoom fisheye lens.
There will be a fisheye zoom similar to Canon EF version with an RF mount. The optics of this zoom are a completely new design and should work well on both APC-S and full-frame mirrorless cameras.
Currently, Canon’s only fisheye lens is Canon RF5.2mm F2.8 L USM Dull Lens Fisheye for VR/AR. Few people this lens for stills shooting.
We can expect a new fisheye zoom lens that is smaller and has better performance than Canon EF mount.
Read More 2023 Canon RF Lens Roadmap